Just recently my 99' ExPLr is running fine one minute and then the temp gage shoots past (H) and the RPM run higher (note: I have idle set approx 900 RPMs; runs about 1700-2000.) and the A/C blows out hot air when this happens. And then after a few it will return to normal. What are your thoughts? What should I try first?
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Check that the oil cooler fins are clean and not blocked for dust or dirt. Next check the oil flow through the cooler as it may be too high and not giving the oil a chance to exchange the heat to the air. You may have to insert a restriction in the return line to achieve this. Or conversely there may be a restriction from say a squashed oil line that is not allowing the oil to flow. Next suggestion is to talk with the caterpillar service technicians and find out why their machine is overheating. I am not sure but if you have a oil cooler inside the radiator maybe the water is running hotter than it should be. Check that the fan belts are tensioned correctly and are not slipping. To achieve this check that all the belts are the same tension and that one belt is not loose compared to the others.
Your cars thermostat needs replaced it is stuck closed. to test this wen stopped engine running lower windows turn heat on blower to high if your temp gauge lowers in temp have it fixed ASAP. Not much money unless you wait till your engine overheats then BIG BUCKS
Just finished fixing my daughters 1999 taurus heat. It would blow warm only when running down the road. At idle it blew cold. I started with replacing thermostat, and water pump because they are the easier fix. Still did not help. Then I replaced the heater core. A daunting job but not that hard to move the dash slighly out of the way to replace. There is a good write up at tarusclub.com. After that, heat was better but at idle, it would still blow cool sometimes. Researched and found answer. Park car on the steepest hill you can find with front of car up. Start car and take off reservoir cap. Let car warm up and keep rpms about 1500. After a while the fluid will come running out of the car and all over the place but it will bring air bubbles with it. Reduce rpm, add more fluid and repeat about 3 times. It will make a mess but after that, the heater works perfectly. We get heat long before the temp gage indicates any and it never blows cold unless you lower the temp.